YF-KYN450-12 Compact Withdrawable Switchgear

That is its most typical use. At 475 to 550 mm wide and 1100 mm deep it is a size down from an ordinary 12 kV cubicle and will often fit an existing switchroom without civil work, while rated breaking to 40 kA meets a system fault capacity raised by an upstream change. Three things are checked first: whether the clear depth takes the 1100 mm cubicle plus front operating space and truck travel, whether the clear height takes the 2200 mm cubicle plus the busbar bridge, and whether the existing cable trench and entry directions line up. Send the site dimensions and the new system fault capacity and feasibility can be judged.

No. They share the 450 platform and a similar width, but they are different equipment classes. This one is the withdrawable pattern, where the isolating gap is formed by racking the truck out. YF-XGN450-12 is box-type fixed pattern, where a disconnector blade inside the cubicle forms a visible isolating gap. Maintenance therefore differs: a withdrawable unit is racked out and replaced whole, a fixed one is worked on inside the cubicle. The choice follows the operating regime and the cost of an outage, not the dimensions.

475 mm is the base width and it carries a stated condition: branch busbar rated current not above 1600 A and breaking current not above 31.5 kA. Beyond that the width goes to 550 mm. The exit arrangement adds further: a side top exit adds a 325 mm auxiliary cubicle at the side, a rear top exit adds a 200 mm rear cubicle, for which single-core cable is preferred. Metering and arc-suppression VT cubicles have their own widths, between 600 and 800 mm. So the overall line-up length has to be added up from each cubicle actual scheme; multiplying 475 by the cubicle count will not give it.

Four, strung along the operating sequence. Once the truck moves from the service position to the isolated or test position, the shutters cover the fixed-contact boxes to prevent entry into a live compartment, and can be padlocked for maintenance. With the circuit breaker closed, the truck can neither be withdrawn from service nor pushed from isolated or test into service; conversely the truck must be fully locked in the test or the service position before the breaker can be operated. The earthing switch can be operated only with the truck in the isolated or test position or removed from the cubicle, and once it is closed the truck cannot be pushed back into service. With the truck in service the secondary plug is locked and cannot be withdrawn; and until the plug is connected, the breaker on the truck can only be opened, its closing mechanism being held by an electromagnetic lock.

It does not. Rated breaking current is 25, 31.5 and 40 kA, rated making and dynamic withstand 63, 80 and 100 kA, with a 4 s thermal rating — the same tier as ordinary-sized cubicles of the class. The value is chosen from the system fault capacity at the installation point, not inferred from the cubicle size. Send the fault capacity or the short-circuit calculation and the rating is taken as the first step not below it.

The steps are 630, 1250 and 1600 A, chosen against that circuit’s duty and independent of the fault level — the fault level follows the system fault capacity and rated current follows the load, and neither is derived from the other. Where a circuit needs more than 1600 A this model does not apply and a higher-rated member of the series should be used; the series page carries the full five-model comparison.

Four things give a preliminary scheme: the single-line diagram, rated voltage with each circuit’s rated current, the system fault capacity, and the switchroom clear dimensions with height. For a contract-grade quotation, add each cubicle’s primary scheme, control supply type and voltage, metering and protection requirements, cable entry arrangement and cable sizes, communication interfaces, and the standards and document list for the destination market.

Yes. Switchgear is supplied as equipment while an MV switchgear E-House or power module is supplied as an enclosure — the first is the panel itself, the second covers the enclosure, equipment layout, auxiliary systems and interface integration. The narrow cubicle and 1100 mm depth fit more bays into a given module length and allow a narrower module. Where it goes inside as the primary equipment, ETENZ details the line-up arrangement, busbar connections and in-module interfaces, and the delivery boundary is settled once at contract stage.